A triangle.
This is true, by definition. Assume that there is a circle that passes through each vertex of a triangle. Then its centre, which we may call the circumcentre of the triangle, must be at an equal distance from each of the vertices because all of the points of the circle are at the same distance from this point.
A triangle containing an obtuse angle is an obtuse triangle.
They would be intersecting.
i don't get the joke. kidding. an equilateral triangle
A notch
The point of a triangle is called a vertex, same goes with rectangles and all other shapes with points.
you call it the PEAK
The pinnacle or acme.
When all three sides of a triangle are congruent, it is called an equilateral triangle.
The peak
The peak
i would call it a square
Since the intersection of the perpendicular bisectors of a triangle is the center of the inscribed circle (we call it the centroid of a triangle), the answer is no.
would call that a triangular pyramid.
hypotenuse
Christians would call Jesus the son of the Highest, because Christians believe that Jesus was the son of God.